fix type

packages/docusaurus-types/src/bundler.d.ts

@@ -5,13 +5,13 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import type * as webpack from 'webpack';
+import type webpack from 'webpack';
 
 // We use Webpack and Rspack interchangeably because most Rspack APIs are
 // compatible with Webpack. So it's ok to use Webpack types for Rspack too.
 // When compatibility doesn't work, use "CurrentBundler.name"
 // See https://github.com/facebook/docusaurus/pull/10402
 export type CurrentBundler = {
   name: 'webpack' | 'rspack';
-  instance: webpack;
+  instance: typeof webpack;
 };